.alert{padding:15px;margin-bottom:20px;border:1px solid transparent;border-radius:4px}
.alert-success{color:#3c763d;background-color:#dff0d8;border-color:#d6e9c6}
.alert-info{color:#31708f;background-color:#d9edf7;border-color:#bce8f1}
.alert-warning{color:#8a6d3b;background-color:#fcf8e3;border-color:#faebcc}
.alert-danger{color:#a94442;background-color:#f2dede;border-color:#ebccd1}
.footer{margin:3em auto;text-align:center}